Finding the Fourth Proportional to 1,513.45, 2,123.15 and 1,513.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,513.45 : 2,123.15 = 1,513.45 : x
2. Step 2: Convert to fraction form
   1,513.45/2,123.15 = 1,513.45/x
3. Step 3: Cross multiply
   1,513.45x = 2,123.15 × 1,513.45
4. Step 4: Simplify right side
   1,513.45x = 3,213,281.37
5. Step 5: Solve for x
   x = 3,213,281.37/1,513.45
6. Step 6: Final answer
   x = 2,123.15